stock mas limit finally found?
5 bar here but...
I'm running it only to 30 psi since i got a stock motor it should be enough data to setup the limit of the sensor with that amount of boost. Sensor is linear so most of the data points that need adjustment are in the lower range where the highest VE gradients are.
Adjustments are very easy if you think the load isn't high enough because you need more fuel you just set the load higher for the boost level. Pretty straightforward.
You are also welcome to the rom I've setup for the 5 bar sensor.
I'm running it only to 30 psi since i got a stock motor it should be enough data to setup the limit of the sensor with that amount of boost. Sensor is linear so most of the data points that need adjustment are in the lower range where the highest VE gradients are.
Adjustments are very easy if you think the load isn't high enough because you need more fuel you just set the load higher for the boost level. Pretty straightforward.
You are also welcome to the rom I've setup for the 5 bar sensor.
Im doing the conversion to SD pretty soon and I'll be using a AEM 5 bar map sensor. Can I get a copy of that rom? Thanks
Sure if you want the current one send me a pm with email if you want to wait a couple days while i iron out the low load spots you can get that version.
Well starting to notice a pretty unique trend in my tweaking. The low load is really much more VE efficient than i believed. It seems I'll be putting in values over 100% from 1500-3500rpm where i got a lean spot forming in the middest of seemingly perfect 14.7 deviation.
Starting to wonder if the cause of this lean spot is due to the cams I'm using.
Starting to wonder if the cause of this lean spot is due to the cams I'm using.
Well got still some minor deviations from perfect 14.7 which I think may be attributed to ignition timing so i'm going to try lowering those points a bit. All and all its nothing the O2 sensor couldn't take care of. Only real rich spot is just before load reaches 0 around 10 or so.
I also think the car runs slightly richer when its cold out which is weird but may have something to do with a table i'm not adjusting.
I also think the car runs slightly richer when its cold out which is weird but may have something to do with a table i'm not adjusting.
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I had the same problem with the maf-t back in the day...the fixed IAT temp of 80* meant the ecu didn't compensate for weather changes. SD should have an IAT sensor though.
how big of a AFR drift are we talking about between a cold morning and hot afternoon. I used to see mid 10's afr to 12's, completely unacceptable so I ditched the maf-t
how big of a AFR drift are we talking about between a cold morning and hot afternoon. I used to see mid 10's afr to 12's, completely unacceptable so I ditched the maf-t
its only a problem if you do not have temp compensation tuned correctly. If you don't, it can be anywhere from a nagging issue when the weather gets hot to a really big problem when the weather gets cold.
I had the same problem with the maf-t back in the day...the fixed IAT temp of 80* meant the ecu didn't compensate for weather changes. SD should have an IAT sensor though.
how big of a AFR drift are we talking about between a cold morning and hot afternoon. I used to see mid 10's afr to 12's, completely unacceptable so I ditched the maf-t
how big of a AFR drift are we talking about between a cold morning and hot afternoon. I used to see mid 10's afr to 12's, completely unacceptable so I ditched the maf-t
It might be cheating but.... I was thinking over the weekend.... we have all the scaling tables for the stock maf, so what is the limit choke because the diameter of the tube the maf if is in, why not just log the of the maf and fuel trims, and build a bigger housing for the maf, log and correct the scalings in the maf to get the fuel trims back inline, similar to how you rescale the MAF for new filters etc.
Im not sure if its possible.....or worth while with SD, but it is still using the "stock maf" just in a bigger pipe... just a thought...
Another Idea I had was because the 8/9 maf is sort of one plastic piece, and to get the sensor part out, it seems that it would have to hacked apart considerably, maybe we could the maf out of a X because it is bolt in.... and put it in a bigger pipe and rescale.... That would for sure be cheating, but it is "A" "stock MAF hahaha.....
Just throwing out ideas.....
Im not sure if its possible.....or worth while with SD, but it is still using the "stock maf" just in a bigger pipe... just a thought...
Another Idea I had was because the 8/9 maf is sort of one plastic piece, and to get the sensor part out, it seems that it would have to hacked apart considerably, maybe we could the maf out of a X because it is bolt in.... and put it in a bigger pipe and rescale.... That would for sure be cheating, but it is "A" "stock MAF hahaha.....
Just throwing out ideas.....
I'm assuming the table is called air temperature compensation but i have no idea what the units represent.
It might be cheating but.... I was thinking over the weekend.... we have all the scaling tables for the stock maf, so what is the limit choke because the diameter of the tube the maf if is in, why not just log the of the maf and fuel trims, and build a bigger housing for the maf, log and correct the scalings in the maf to get the fuel trims back inline, similar to how you rescale the MAF for new filters etc.
Im not sure if its possible.....or worth while with SD, but it is still using the "stock maf" just in a bigger pipe... just a thought...
Another Idea I had was because the 8/9 maf is sort of one plastic piece, and to get the sensor part out, it seems that it would have to hacked apart considerably, maybe we could the maf out of a X because it is bolt in.... and put it in a bigger pipe and rescale.... That would for sure be cheating, but it is "A" "stock MAF hahaha.....
Just throwing out ideas.....
Im not sure if its possible.....or worth while with SD, but it is still using the "stock maf" just in a bigger pipe... just a thought...
Another Idea I had was because the 8/9 maf is sort of one plastic piece, and to get the sensor part out, it seems that it would have to hacked apart considerably, maybe we could the maf out of a X because it is bolt in.... and put it in a bigger pipe and rescale.... That would for sure be cheating, but it is "A" "stock MAF hahaha.....
Just throwing out ideas.....